What an account is for
It keeps your papers, the checks you have run, and every warrant you have assigned, under one identity that a supervisor or an editor can rely on.
A warrant record names the person who did the checking, so the work needs somewhere stable to be named from.
We ask for one thing at a time. An email address now, because your work needs somewhere to live. Your name and role later, only when you export something that has to name an author. Anything you decline leaves what is already on your screen exactly where it is.